Electric resistance furnace



g A H. M. BIEBEL ELECTRIC RESISTANCE FURNACE med June so, 192s INVENT'oR Herma/7 /`7. 5/'ebe/ ATTORNEY.

WITN `ESSES:

Patented Aug. 16, 1.927.

UNITED STATES PATENT OFFICE.

' HERMAN M. BIEBEL, OF OAKMONT, PENNSYLVANIA,

issiGNoii To wiis'rINeHoUsn ELECTRIC RESISTANCE FURNACE. i

Application led June '30, 1923. Serial No. 648,717.-

My invention relates to electric furnaces and particularly to electric resistance furnaces.

The object of my invention is to provide relatively small means for supporting a relatively heavy and preformed resistor member adjacent to the walls of a furnace.

In .practicing my invention, I provide a plurality of spaced sets of spaced hooks mounted in the refractory wall of the furnace structure to support a relatively heavy resistor member preformed to comprise a pluralit of integral, end-connected and substantia y parallel-extending, straight convelutions in the furnace chamber adjacent to the wall.

The hooks may be screwedintoblocks of metal or other refractory material located in the wall or they may be provided with inner ends of T- or of L-shape and be fitted yinto slots or openings in the wall. Means integral with the hooks may be provided at the outer ends thereof to prevent tilting of the hooks when carryingthe weight of the '25 resistor member.

In the single sheet of drawings,

Figure 1 is a view, in vertical lateral section, of lan electric resistance furnace embod ing my invention, n

2 is an enlarged sectional view of a smalpart of the furnace structureillustratin1 the device embodying ni invention,

ig. 3 is a view, in front e evation, of the part shown in Fi 2,- ,f

Fi 4 is an en arged sectional view of a smal part of a furnace structure and lof a modied form of device embodying my invention, v

Fig. r5 is a view, in section thereof, taken on the line. V-V of Fig. 4, and

F ig. 6 is a view, in frontelevation, of the parts shown in Fig. 4.-.

An electric resistance furnace 11 coniprises a lurality of buter walls 12 having an inner ining 13 therein, the outer and the inner walls being so spaced as to provide a furnace chamber 14 of a suitable or desired contour' and dimensions. The outerand inner Ywalls are built up of suitable refractory heat and electric insulating and high temperature-resisting materials usually eni-v 4ployed in the art. l

A plurality of spaced sets of spaced hooks 15 having screw-threaded inner end portions ate end connections,

' of the lWall of the furnace,

16, the screwthreads being relatively coarse are located'in the walls of the furnace structure. A refractory screw-threaded plate 17 which isv provided for each of the hooks` 15, ma `located in a suitable chamber 18 provi d in the outer wall 12, a suitable opening 19 permitting of the hook member 15 being inserted therethrough to have screwthreaded engagement with the block 16.

.A resistor member 21 comprises a relatively heavy rod or bar of a suitable resistor material that is preformed to comprise a plurality of integral, end-connected, and substantially 4parallel-extending, straight convolutions.

The distance between the spaced sets of hook members 15 is in accordance with the thickness of the rod comprising the resistor member 21 to the effect that the resistor member may lbe substantially self-supporting between the hook members l5, each convo ution of the resistor member being supported by two or Amore hook members located in spaced relation relatively to each other. If'it is found desirable or necessary to prevent longitudinal movement of the resistor member 21, durin the operation of (ill the furnace when it is su 'ected to repeated heating and cooling, thel ook members' 15 may be located relatively close to the arcuthereby preventing any shifting of the 'heating element relatively to the hooks when the and contracts.

. Substantially the saine construction, as described for the particularly extendin walls may be employed for the roof or cei ng of the furn ce structure. The end portions of the resist r member 21 may be bent at substantially right angles to the general plane f dividual resistor member and extend t rough suitable openings 22 in the as illustrated more particularly in Fig. 1 of the drawing.

The resistor memberA may bev 'placed in its l proper operative position in the hook4 inemers 15 by successively causing thel convolutions to rest in the hook members,v the preformed resistor member -possessing enough resiliency to permit offmoving the individual convolutions sufficiently laterally of each other to permit of causing them to engage the co-operating hook members 15. The resistor member may be removedby substanresistor member expands tially the reverse operation of that described y for the assemblythereof.

are of Aeither T or 1 tially registering therewith, in the outer lin- The hook member 23 is inserted in with the inner end of T or.

ing 12.

' of L-sha e in alinement with the opening 4 wall oft e furnace an and I'is t en given -a turning movement of substantially 90 to cause it to be interlocked with the walls of the hereinbefore described chamber substantially as illustrated in Fig. 5- of the drawing.

vAs sufficient clearance must be allowed bef tween the hook member and the walls of the v furnace, there would be a tendency for the hook member 23 totilt slightly when carrying the weight of the resistor member and to overcome this, I provide an integral and downwardly extending lug portion 25 at the front end of the hook member which is ef-I fective to prevent substantially all such tiltin movement.

, he openin 24 and the chambers 18 may be provided uring the construction of the furnace structure and it is a relatively small matter to place a plurality of hook members 23 in their proper operative positions and then mount the resistormember therein or, if found desirable, thev individual convolu- 'tions of the resistor member may be held in their pro r operative ositions against the the hook members inserted successiyely in their proper locations and positions, whereby one convolution -after the other will be properly supported. The device embodying my invention thus provides a relatively small device that is easily installed in, and removed from, a

furnace structure to permit of supporting a.

relatively heavy and preformed resistor member therein lin lsuch manner that substantially all of the length of the resistor member shall be in heat vradiati relation to the furnace chamber and sha1 not be covered to any extent by 'the supporting I means.

Various modifications and changes may be made without departing from the splirit and scope of the invention and I desire, t erefore,

f that only. such'limitations shall be placed thereon as are imposed Aby the rior art or are set forth in the` vappended c aims.

I claim as my invention;4

1.l In an electric furnace,

comprisiilg a plurality of end-connected substanti y parallel-extending straight convolutions, anda plurality of spaced hook membersre'movably mounted in and. interlocked with a wall of said furnace for supporting said resistor member.

A relatively furnace-chamber,

su portedr by loc ed therewith, vfor operatively engaging4 hooks having inner en in combination,- ze preformed, relatively heavy resistor mein-v 2. In an electric furnace, in combination, a plurality of refractory walls enclosing a furnace chamber, a plurality of spaced sets of hooks sup orted in spaced relation relatively to eac other in one of said walls, said hooks being removably mounted in and interlocked with one of said walls, and a relatively heavy resistor member preformed to comprise a pluralit of substantially par allel-extendinrr straigltv convolutions, each of said convolutions eing supported by at least two of said hooks.

3. In an electric furnace, in combination, a plurality of refractory walls enclosing a furnace chamber, a relatively heavy resistor member preformed to comprise a plurality of end-connected, inte ral, substantially parallel-extending, straig t convolutions, and a plurality of spaced sets of spaced hooks, one hook in each set o eratively engaging a convolution between t eend-connections to su port the same free of, but adjacent to, t ic wall.

4. In'an electric furnace, in combination, a plurality of refractory walls enclosing a a relatively heavy resistoiI member preformed to comprise a plurality of integral, end-connected substantially parallel-extending, straight convolutons, and :i plurality of spaced hooks for releasabl suporting said resistor member, said hoo s being so mounted in one of said walls as to be removable therefrom by a turning movement relatively thereto.

5. In an electric furnace, in combination,r a plurality of refractory walls enclosing o furnace chamber, a relatively heavy resistor member preformed to comprise aplurality of. endconnected,fintegral, substantially parallel-extending, straight, convolutions ani a plurality of' hook members,f removably .one of said walls and intersaid convolutions at spaced points to support said resistor in its operative position in said furnace chamber.

lic

6. In an electric furnace, in combination, i

a plurality of refractory walls enclosing a. furnace chamber, a relatively heavy resistor member preformed to comprise a plurality of integral end-connected, substantially parallel-extending, straight convolutons, and a plurality of spaced `hooks projecting outwardly from one of said walls to operatively engage and support said resistor member, sai

ds of substantially T- shape to fit into o `nii'igs in said wall to support said hooks t erein, and having also integral means to prevent tilting thereof when su porting said resistor/member.

n `testimony whereof, I have hereunto: ibcribed my name HERMAN M.l BIEBEL.. I

this 27th day of June,' 

